master key

noun
a key that will open a number of different locks, the proper keys of which are not interchangeable.

Origin:
1570–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
master key
 
n
Also called: pass key a key that opens all the locks of a set, the individual keys of which are not interchangeable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Master key is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
The contractor shall provide padlocks for each disconnect switch and receptacle
  box with a master key for all locks.
In an individually-keyed padlock system, there is no master key, and all of the
  locks must be opened with their own key.
Please verify that the contractor is to provide a master key system for new
  hardware.
The master key may be different in each of the seven state emergency response
  regions.
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